Your opinion of Smith's M&P .357s 3.5" barrel.[/B] I'm an old retired guy still partial to wheel guns. My companion for over twenty years has been a Ruger Security Six 4". I have a chance to pickup Ruger GP-100 3" or the Smith M&P .357s not both ... $$$ in short supply. Presently leaning toward the "Smith even though the ammo is not interchangeable with my Ruger. Would like to get some opinions. Thanks.